openHAB might be a bit more popular than Sensi. We know about 1 link to it since March 2021 and only 1 link to Sensi. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Smart thermostat, https://sensi.emerson.com/en-us turn off the water heater, close your water main and drain your supplies by opening all your fixtures, you can add rv antifreeze to your toilets, I don't, this year we bought these https://heattrak.com/collections/residential-mats with a smart outlet and a web cam to see the snow. Source: over 2 years ago
You can start on a general home automation like openhab.org. Source: over 1 year ago
Gideon Smart Home - Control your home devices from a single app.
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
ioBroker - flexible and modular application for the IoT and Smarthome
Google Home - Set up, manage, and control your Chromecast, Chromecast Audio and Google Home devices.
Domoticz - Domoticz is a lightweight Home Automation System
Jeedom - Jeedom is a complete home-automation software.